Gas flow controller



FIG. 1 is a perspective view of a gas flow controller showing our new design;

FIG. 2 is a perspective view with the gas flow controller inverted;

FIG. 3 is a top plan view;

FIG. 4 is a side elevational view of one of the two identical sides;

FIG. 5 is an end elevational view of one of the two identical ends; and,

FIG. 6 is a bottom plan view. 

The ornamental design for a gas flow controller, as shown and described. 